Dad's Hat Penn Rye Whiskey Bottled In Bond 100 Proof is a whiskey of integrity that should be tasted in its full, bond-certified glory. Special barrels made with 3-year-old air-dried white oak were used to age this spirit, resulting in rich, concentrated flavors imparted by the wood. After maturing in these barrels for 5 years, the emerging whiskey is a classic Pre-Prohibition Pennsylvania Bottled in Bond.